Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
chieu sang » chieu sach, chieu xanh, hieu lang
dien anh » tieng anh
dien dan » hien dai, vien dai, gian dan
tranh va » tranh van, trang va, trinh va
cong tac » cong ty
tac doan » tap doan, tan doan, thai doan
doan cao » doanh cao, toan cao, doan cap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((((dien anh) OR (dien dan))) OR (chieu sang)) - canh tranh va thuong cong tac doan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((((dien anh) OR (dien dan))) or (chieu sang)) - canh tranh va thuong cong tac doan cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((((dien anh) OR (dien dan))) or (chieu sang)) - canh tranh va thuong cong tac doan cao*.